Update dependency defectdojo/defectdojo-nginx to v2.13.1

This MR contains the following updates:

Package	Type	Update	Change
defectdojo/defectdojo-nginx	ironbank-docker	minor	2.12.0 -> 2.13.1
defectdojo/defectdojo-nginx		minor	2.12.0 -> 2.13.1
defectdojo/defectdojo-nginx	stage	minor	2.12.0 -> 2.13.1

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